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irradiance_volumes.rs
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irradiance_volumes.rs
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//! This example shows how irradiance volumes affect the indirect lighting of
//! objects in a scene.
//!
//! The controls are as follows:
//!
//! * Space toggles the irradiance volume on and off.
//!
//! * Enter toggles the camera rotation on and off.
//!
//! * Tab switches the object between a plain sphere and a running fox.
//!
//! * Backspace shows and hides the voxel cubes.
//!
//! * Clicking anywhere moves the object.
use bevy::core_pipeline::Skybox;
use bevy::math::{uvec3, vec3};
use bevy::pbr::irradiance_volume::IrradianceVolume;
use bevy::pbr::{ExtendedMaterial, MaterialExtension, NotShadowCaster};
use bevy::prelude::*;
use bevy::render::render_resource::{AsBindGroup, ShaderRef, ShaderType};
use bevy::window::PrimaryWindow;
// Rotation speed in radians per frame.
const ROTATION_SPEED: f32 = 0.2;
const FOX_SCALE: f32 = 0.05;
const SPHERE_SCALE: f32 = 2.0;
const IRRADIANCE_VOLUME_INTENSITY: f32 = 1800.0;
const AMBIENT_LIGHT_BRIGHTNESS: f32 = 0.06;
const VOXEL_CUBE_SCALE: f32 = 0.4;
static DISABLE_IRRADIANCE_VOLUME_HELP_TEXT: &str = "Space: Disable the irradiance volume";
static ENABLE_IRRADIANCE_VOLUME_HELP_TEXT: &str = "Space: Enable the irradiance volume";
static HIDE_VOXELS_HELP_TEXT: &str = "Backspace: Hide the voxels";
static SHOW_VOXELS_HELP_TEXT: &str = "Backspace: Show the voxels";
static STOP_ROTATION_HELP_TEXT: &str = "Enter: Stop rotation";
static START_ROTATION_HELP_TEXT: &str = "Enter: Start rotation";
static SWITCH_TO_FOX_HELP_TEXT: &str = "Tab: Switch to a skinned mesh";
static SWITCH_TO_SPHERE_HELP_TEXT: &str = "Tab: Switch to a plain sphere mesh";
static CLICK_TO_MOVE_HELP_TEXT: &str = "Left click: Move the object";
static GIZMO_COLOR: Color = Color::YELLOW;
static VOXEL_TRANSFORM: Mat4 = Mat4::from_cols_array_2d(&[
[-42.317566, 0.0, 0.0, 0.0],
[0.0, 0.0, 44.601563, 0.0],
[0.0, 16.73776, 0.0, 0.0],
[0.0, 6.544792, 0.0, 1.0],
]);
// The mode the application is in.
#[derive(Resource)]
struct AppStatus {
// Whether the user wants the irradiance volume to be applied.
irradiance_volume_present: bool,
// Whether the user wants the unskinned sphere mesh or the skinned fox mesh.
model: ExampleModel,
// Whether the user has requested the scene to rotate.
rotating: bool,
// Whether the user has requested the voxels to be displayed.
voxels_visible: bool,
}
// Which model the user wants to display.
#[derive(Clone, Copy, PartialEq)]
enum ExampleModel {
// The plain sphere.
Sphere,
// The fox, which is skinned.
Fox,
}
// Handles to all the assets used in this example.
#[derive(Resource)]
struct ExampleAssets {
// The glTF scene containing the colored floor.
main_scene: Handle<Scene>,
// The 3D texture containing the irradiance volume.
irradiance_volume: Handle<Image>,
// The plain sphere mesh.
main_sphere: Handle<Mesh>,
// The material used for the sphere.
main_sphere_material: Handle<StandardMaterial>,
// The glTF scene containing the animated fox.
fox: Handle<Scene>,
// The animation that the fox will play.
fox_animation: Handle<AnimationClip>,
// The voxel cube mesh.
voxel_cube: Handle<Mesh>,
// The skybox.
skybox: Handle<Image>,
}
// The sphere and fox both have this component.
#[derive(Component)]
struct MainObject;
// Marks each of the voxel cubes.
#[derive(Component)]
struct VoxelCube;
// Marks the voxel cube parent object.
#[derive(Component)]
struct VoxelCubeParent;
type VoxelVisualizationMaterial = ExtendedMaterial<StandardMaterial, VoxelVisualizationExtension>;
#[derive(Asset, TypePath, AsBindGroup, Debug, Clone)]
struct VoxelVisualizationExtension {
#[uniform(100)]
irradiance_volume_info: VoxelVisualizationIrradianceVolumeInfo,
}
#[derive(ShaderType, Debug, Clone)]
struct VoxelVisualizationIrradianceVolumeInfo {
transform: Mat4,
inverse_transform: Mat4,
resolution: UVec3,
intensity: f32,
}
fn main() {
// Create the example app.
App::new()
.add_plugins(DefaultPlugins.set(WindowPlugin {
primary_window: Some(Window {
title: "Bevy Irradiance Volumes Example".into(),
..default()
}),
..default()
}))
.add_plugins(MaterialPlugin::<VoxelVisualizationMaterial>::default())
.init_resource::<AppStatus>()
.init_resource::<ExampleAssets>()
.insert_resource(AmbientLight {
color: Color::WHITE,
brightness: 0.0,
})
.add_systems(Startup, setup)
.add_systems(PreUpdate, create_cubes)
.add_systems(Update, rotate_camera)
.add_systems(Update, play_animations)
.add_systems(
Update,
handle_mouse_clicks
.after(rotate_camera)
.after(play_animations),
)
.add_systems(
Update,
change_main_object
.after(rotate_camera)
.after(play_animations),
)
.add_systems(
Update,
toggle_irradiance_volumes
.after(rotate_camera)
.after(play_animations),
)
.add_systems(
Update,
toggle_voxel_visibility
.after(rotate_camera)
.after(play_animations),
)
.add_systems(
Update,
toggle_rotation.after(rotate_camera).after(play_animations),
)
.add_systems(
Update,
draw_gizmo
.after(handle_mouse_clicks)
.after(change_main_object)
.after(toggle_irradiance_volumes)
.after(toggle_voxel_visibility)
.after(toggle_rotation),
)
.add_systems(
Update,
update_text
.after(handle_mouse_clicks)
.after(change_main_object)
.after(toggle_irradiance_volumes)
.after(toggle_voxel_visibility)
.after(toggle_rotation),
)
.run();
}
// Spawns all the scene objects.
fn setup(
mut commands: Commands,
assets: Res<ExampleAssets>,
app_status: Res<AppStatus>,
asset_server: Res<AssetServer>,
) {
spawn_main_scene(&mut commands, &assets);
spawn_camera(&mut commands, &assets);
spawn_irradiance_volume(&mut commands, &assets);
spawn_light(&mut commands);
spawn_sphere(&mut commands, &assets);
spawn_voxel_cube_parent(&mut commands);
spawn_fox(&mut commands, &assets);
spawn_text(&mut commands, &app_status, &asset_server);
}
fn spawn_main_scene(commands: &mut Commands, assets: &ExampleAssets) {
commands.spawn(SceneBundle {
scene: assets.main_scene.clone(),
..SceneBundle::default()
});
}
fn spawn_camera(commands: &mut Commands, assets: &ExampleAssets) {
commands
.spawn(Camera3dBundle {
transform: Transform::from_xyz(-10.012, 4.8605, 13.281).looking_at(Vec3::ZERO, Vec3::Y),
..default()
})
.insert(Skybox {
image: assets.skybox.clone(),
brightness: 150.0,
});
}
fn spawn_irradiance_volume(commands: &mut Commands, assets: &ExampleAssets) {
commands
.spawn(SpatialBundle {
transform: Transform::from_matrix(VOXEL_TRANSFORM),
..SpatialBundle::default()
})
.insert(IrradianceVolume {
voxels: assets.irradiance_volume.clone(),
intensity: IRRADIANCE_VOLUME_INTENSITY,
})
.insert(LightProbe);
}
fn spawn_light(commands: &mut Commands) {
commands.spawn(PointLightBundle {
point_light: PointLight {
intensity: 250000.0,
shadows_enabled: true,
..default()
},
transform: Transform::from_xyz(4.0762, 5.9039, 1.0055),
..default()
});
}
fn spawn_sphere(commands: &mut Commands, assets: &ExampleAssets) {
commands
.spawn(PbrBundle {
mesh: assets.main_sphere.clone(),
material: assets.main_sphere_material.clone(),
transform: Transform::from_xyz(0.0, SPHERE_SCALE, 0.0)
.with_scale(Vec3::splat(SPHERE_SCALE)),
..default()
})
.insert(MainObject);
}
fn spawn_voxel_cube_parent(commands: &mut Commands) {
commands
.spawn(SpatialBundle {
visibility: Visibility::Hidden,
..default()
})
.insert(VoxelCubeParent);
}
fn spawn_fox(commands: &mut Commands, assets: &ExampleAssets) {
commands
.spawn(SceneBundle {
scene: assets.fox.clone(),
visibility: Visibility::Hidden,
transform: Transform::from_scale(Vec3::splat(FOX_SCALE)),
..default()
})
.insert(MainObject);
}
fn spawn_text(commands: &mut Commands, app_status: &AppStatus, asset_server: &AssetServer) {
commands.spawn(
TextBundle {
text: app_status.create_text(asset_server),
..TextBundle::default()
}
.with_style(Style {
position_type: PositionType::Absolute,
bottom: Val::Px(10.0),
left: Val::Px(10.0),
..default()
}),
);
}
// A system that updates the help text.
fn update_text(
mut text_query: Query<&mut Text>,
app_status: Res<AppStatus>,
asset_server: Res<AssetServer>,
) {
for mut text in text_query.iter_mut() {
*text = app_status.create_text(&asset_server);
}
}
impl AppStatus {
// Constructs the help text at the bottom of the screen based on the
// application status.
fn create_text(&self, asset_server: &AssetServer) -> Text {
let irradiance_volume_help_text = if self.irradiance_volume_present {
DISABLE_IRRADIANCE_VOLUME_HELP_TEXT
} else {
ENABLE_IRRADIANCE_VOLUME_HELP_TEXT
};
let voxels_help_text = if self.voxels_visible {
HIDE_VOXELS_HELP_TEXT
} else {
SHOW_VOXELS_HELP_TEXT
};
let rotation_help_text = if self.rotating {
STOP_ROTATION_HELP_TEXT
} else {
START_ROTATION_HELP_TEXT
};
let switch_mesh_help_text = match self.model {
ExampleModel::Sphere => SWITCH_TO_FOX_HELP_TEXT,
ExampleModel::Fox => SWITCH_TO_SPHERE_HELP_TEXT,
};
Text::from_section(
format!(
"{}\n{}\n{}\n{}\n{}",
CLICK_TO_MOVE_HELP_TEXT,
voxels_help_text,
irradiance_volume_help_text,
rotation_help_text,
switch_mesh_help_text
),
TextStyle {
font: asset_server.load("fonts/FiraMono-Medium.ttf"),
font_size: 24.0,
color: Color::ANTIQUE_WHITE,
},
)
}
}
// Rotates the camera a bit every frame.
fn rotate_camera(
mut camera_query: Query<&mut Transform, With<Camera3d>>,
time: Res<Time>,
app_status: Res<AppStatus>,
) {
if !app_status.rotating {
return;
}
for mut transform in camera_query.iter_mut() {
transform.translation = Vec2::from_angle(ROTATION_SPEED * time.delta_seconds())
.rotate(transform.translation.xz())
.extend(transform.translation.y)
.xzy();
transform.look_at(Vec3::ZERO, Vec3::Y);
}
}
// Toggles between the unskinned sphere model and the skinned fox model if the
// user requests it.
fn change_main_object(
keyboard: Res<ButtonInput<KeyCode>>,
mut app_status: ResMut<AppStatus>,
mut sphere_query: Query<
&mut Visibility,
(With<MainObject>, With<Handle<Mesh>>, Without<Handle<Scene>>),
>,
mut fox_query: Query<&mut Visibility, (With<MainObject>, With<Handle<Scene>>)>,
) {
if !keyboard.just_pressed(KeyCode::Tab) {
return;
}
let Some(mut sphere_visibility) = sphere_query.iter_mut().next() else {
return;
};
let Some(mut fox_visibility) = fox_query.iter_mut().next() else {
return;
};
match app_status.model {
ExampleModel::Sphere => {
*sphere_visibility = Visibility::Hidden;
*fox_visibility = Visibility::Visible;
app_status.model = ExampleModel::Fox;
}
ExampleModel::Fox => {
*sphere_visibility = Visibility::Visible;
*fox_visibility = Visibility::Hidden;
app_status.model = ExampleModel::Sphere;
}
}
}
impl Default for AppStatus {
fn default() -> Self {
Self {
irradiance_volume_present: true,
rotating: true,
model: ExampleModel::Sphere,
voxels_visible: false,
}
}
}
// Turns on and off the irradiance volume as requested by the user.
fn toggle_irradiance_volumes(
mut commands: Commands,
keyboard: Res<ButtonInput<KeyCode>>,
light_probe_query: Query<Entity, With<LightProbe>>,
mut app_status: ResMut<AppStatus>,
assets: Res<ExampleAssets>,
mut ambient_light: ResMut<AmbientLight>,
) {
if !keyboard.just_pressed(KeyCode::Space) {
return;
};
let Some(light_probe) = light_probe_query.iter().next() else {
return;
};
if app_status.irradiance_volume_present {
commands.entity(light_probe).remove::<IrradianceVolume>();
ambient_light.brightness = AMBIENT_LIGHT_BRIGHTNESS * IRRADIANCE_VOLUME_INTENSITY;
app_status.irradiance_volume_present = false;
} else {
commands.entity(light_probe).insert(IrradianceVolume {
voxels: assets.irradiance_volume.clone(),
intensity: IRRADIANCE_VOLUME_INTENSITY,
});
ambient_light.brightness = 0.0;
app_status.irradiance_volume_present = true;
}
}
fn toggle_rotation(keyboard: Res<ButtonInput<KeyCode>>, mut app_status: ResMut<AppStatus>) {
if keyboard.just_pressed(KeyCode::Enter) {
app_status.rotating = !app_status.rotating;
}
}
// Handles clicks on the plane that reposition the object.
fn handle_mouse_clicks(
buttons: Res<ButtonInput<MouseButton>>,
windows: Query<&Window, With<PrimaryWindow>>,
cameras: Query<(&Camera, &GlobalTransform)>,
mut main_objects: Query<&mut Transform, With<MainObject>>,
) {
if !buttons.pressed(MouseButton::Left) {
return;
}
let Some(mouse_position) = windows
.iter()
.next()
.and_then(|window| window.cursor_position())
else {
return;
};
let Some((camera, camera_transform)) = cameras.iter().next() else {
return;
};
// Figure out where the user clicked on the plane.
let Some(ray) = camera.viewport_to_world(camera_transform, mouse_position) else {
return;
};
let Some(ray_distance) = ray.intersect_plane(Vec3::ZERO, Plane3d::new(Vec3::Y)) else {
return;
};
let plane_intersection = ray.origin + ray.direction.normalize() * ray_distance;
// Move all the main objeccts.
for mut transform in main_objects.iter_mut() {
transform.translation = vec3(
plane_intersection.x,
transform.translation.y,
plane_intersection.z,
);
}
}
impl FromWorld for ExampleAssets {
fn from_world(world: &mut World) -> Self {
// Load all the assets.
let asset_server = world.resource::<AssetServer>();
let fox = asset_server.load("models/animated/Fox.glb#Scene0");
let main_scene =
asset_server.load("models/IrradianceVolumeExample/IrradianceVolumeExample.glb#Scene0");
let irradiance_volume = asset_server.load::<Image>("irradiance_volumes/Example.vxgi.ktx2");
let fox_animation =
asset_server.load::<AnimationClip>("models/animated/Fox.glb#Animation1");
// Just use a specular map for the skybox since it's not too blurry.
// In reality you wouldn't do this--you'd use a real skybox texture--but
// reusing the textures like this saves space in the Bevy repository.
let skybox = asset_server.load::<Image>("environment_maps/pisa_specular_rgb9e5_zstd.ktx2");
let mut mesh_assets = world.resource_mut::<Assets<Mesh>>();
let main_sphere = mesh_assets.add(Sphere::default().mesh().uv(32, 18));
let voxel_cube = mesh_assets.add(Cuboid::default());
let mut standard_material_assets = world.resource_mut::<Assets<StandardMaterial>>();
let main_material = standard_material_assets.add(Color::SILVER);
ExampleAssets {
main_sphere,
fox,
main_sphere_material: main_material,
main_scene,
irradiance_volume,
fox_animation,
voxel_cube,
skybox,
}
}
}
// Plays the animation on the fox.
fn play_animations(assets: Res<ExampleAssets>, mut players: Query<&mut AnimationPlayer>) {
for mut player in players.iter_mut() {
// This will safely do nothing if the animation is already playing.
player.play(assets.fox_animation.clone()).repeat();
}
}
fn create_cubes(
image_assets: Res<Assets<Image>>,
mut commands: Commands,
irradiance_volumes: Query<(&IrradianceVolume, &GlobalTransform)>,
voxel_cube_parents: Query<Entity, With<VoxelCubeParent>>,
voxel_cubes: Query<Entity, With<VoxelCube>>,
example_assets: Res<ExampleAssets>,
mut voxel_visualization_material_assets: ResMut<Assets<VoxelVisualizationMaterial>>,
) {
// If voxel cubes have already been spawned, don't do anything.
if !voxel_cubes.is_empty() {
return;
}
let Some(voxel_cube_parent) = voxel_cube_parents.iter().next() else {
return;
};
for (irradiance_volume, global_transform) in irradiance_volumes.iter() {
let Some(image) = image_assets.get(&irradiance_volume.voxels) else {
continue;
};
let resolution = image.texture_descriptor.size;
let voxel_cube_material = voxel_visualization_material_assets.add(ExtendedMaterial {
base: StandardMaterial::from(Color::RED),
extension: VoxelVisualizationExtension {
irradiance_volume_info: VoxelVisualizationIrradianceVolumeInfo {
transform: VOXEL_TRANSFORM.inverse(),
inverse_transform: VOXEL_TRANSFORM,
resolution: uvec3(
resolution.width,
resolution.height,
resolution.depth_or_array_layers,
),
intensity: IRRADIANCE_VOLUME_INTENSITY,
},
},
});
let scale = vec3(
1.0 / resolution.width as f32,
1.0 / resolution.height as f32,
1.0 / resolution.depth_or_array_layers as f32,
);
// Spawn a cube for each voxel.
for z in 0..resolution.depth_or_array_layers {
for y in 0..resolution.height {
for x in 0..resolution.width {
let uvw = (uvec3(x, y, z).as_vec3() + 0.5) * scale - 0.5;
let pos = global_transform.transform_point(uvw);
let voxel_cube = commands
.spawn(MaterialMeshBundle {
mesh: example_assets.voxel_cube.clone(),
material: voxel_cube_material.clone(),
transform: Transform::from_scale(Vec3::splat(VOXEL_CUBE_SCALE))
.with_translation(pos),
..default()
})
.insert(VoxelCube)
.insert(NotShadowCaster)
.id();
commands.entity(voxel_cube_parent).add_child(voxel_cube);
}
}
}
}
}
// Draws a gizmo showing the bounds of the irradiance volume.
fn draw_gizmo(
mut gizmos: Gizmos,
irradiance_volume_query: Query<&GlobalTransform, With<IrradianceVolume>>,
app_status: Res<AppStatus>,
) {
if app_status.voxels_visible {
for transform in irradiance_volume_query.iter() {
gizmos.cuboid(*transform, GIZMO_COLOR);
}
}
}
// Handles a request from the user to toggle the voxel visibility on and off.
fn toggle_voxel_visibility(
keyboard: Res<ButtonInput<KeyCode>>,
mut app_status: ResMut<AppStatus>,
mut voxel_cube_parent_query: Query<&mut Visibility, With<VoxelCubeParent>>,
) {
if !keyboard.just_pressed(KeyCode::Backspace) {
return;
}
app_status.voxels_visible = !app_status.voxels_visible;
for mut visibility in voxel_cube_parent_query.iter_mut() {
*visibility = if app_status.voxels_visible {
Visibility::Visible
} else {
Visibility::Hidden
};
}
}
impl MaterialExtension for VoxelVisualizationExtension {
fn fragment_shader() -> ShaderRef {
"shaders/irradiance_volume_voxel_visualization.wgsl".into()
}
}